sign in / register

IP Classifications / coding - Advice-04

IP Protection Classification System

The IP system of classification (IP Rating / IP Classification), is designed to indicate the degree of protection against ingress of solid material (including dust) and liquids into enclosures in accordance with BS 5490: 1977, IEC 529: 1976.

It should be noted that this system of quantifying degrees of protection does not relate to protection against rust and corrosion.

The level of protection is normally indicated by the IP Rating Code which consists of the letters IP followed by a 2 digit number, e.g. IP65.

The following brief resume of IP numbers and their meaning, will we hope be helpful in assessing degrees of protection when selecting enclosures.

Whilst not specified by the BSI, a third numeral is also sometimes shown, this figure is used in corresponding international standards to indicate degree of resistance to impact.

FIRST NUMBER - Protection against solid objects

IP     Tests

 0      no protection

 1      protected against; solid objects up to 50mm e.g. accidental touch by hands

 2      protected against; solid objects up to 12mm e.g. accidental touch by fingers

 3      protected against; solid objects over 2.5mm e.g. tools & wires

 4      protected against; solid objects over 1.0mm e.g. tools & wires + small wires

 5      protected against; dust limited ingress, no harmful deposit

 6      protected against dust

(For full details of IP numbers, please refer to the official BS specification).


SECOND NUMBER - Protection against liquids

IP     Tests

 0      no protection

 1      protected against vertically falling drops of water e.g. condensation

 2      protected against direct sprays of water up to 15 degrees from vertical

 3      protected against direct sprays of water up to 60 degrees from vertical

 4       protected against water sprayed from all directions - limited ingress permitted

 5      protected against low pressure jets of water sprayed from all directions - limited ingress permitted

 6      protected against strong jets of water e.g. for use on ship decks - limited ingress permitted

 7      protected against the effects of immersion between 15 cm and 1 metre

 8      protected against long periods of immersion under pressure


click here to return to;
Advice & Solution Finder index page


Back to top
About insight Security
  • It's easy to order from us and we're easy to contact...
    whether you need help or advice before or after you buy
  • Our proven, tried and tested products do what we say...
    which is why we can offer you a 'NO QUIBBLE GUARANTEE'
  • Fast Reliable Service... your goods will normally be delivered within 1 to 3 working days - call us if you need them urgently!
  • All our products are very competitively priced... but more importantly, we believe they offer you the Very Best Value!

...these are just a few of the reasons that most of our customers buy from us regularly and recommend us to friends and peer groups. So buy now with confidence - and join the thousands of happy customers we have helped over the last 20 years... and remember, if you're not sure what you need, or which solution is best for you, our specialist advisors will be pleased to help. Just call us on 01273 475500.